| 摘要 |
Provided is a heat pump type water heater, which has a small number of parts, which has a simple structure but can prevent the freeze of a drain pan, and which has a drain residual hardly left in a drain pan. The heat pump type water heater comprises a refrigerating cycle, a water circuit and a three-way valve (12). The refrigerating cycle is constituted by sequentially connecting, with use of piping, a compressor (1), a four-way valve (2) for switching the flow direction of a coolant, a water heat exchanger (3) for causing the coolant and the water to exchange heat, an expansion valve (4) for adjusting the flow rate of the coolant thereby lowering the pressure, and an air heat exchanger (5) for causing the air and the coolant to exchange the heat. The water circuit is constituted by sequentially connecting the water heat exchanger (3), a hot water tank (7) for reserving the water heated by the water heat exchanger (3), and a pump (11). The three-way valve (12) is so interposed between the pump (11) and the water heat exchanger (3) that the water circuit may flow to an air heat exchanger lower-stage path (5a) and may return to the water heat exchanger (3). Further comprised is a control unit for switching the three-way valve (12) of the water circuit, thereby causing the hot water in the hot water tank to flow to the air heat exchanger lower-stage path (5a). |
